wenstrom



J WBNSTROM MAGNETIC SEPARATOR.

(No Model.)

Patented Nov. 15, 1887.

I H. I

v UNITED STATES PATENT @erica JoNAs wnNsTRM, on onnnno, swEDnN.

MAGNETlC'sEPARAToR.

SPECIFICATION forming part of Letters Patent No. 373,211, dated November 15, 1887.

Application tiled July 9, 1885. Serial No. 171.145. (No model.) Patented in Sweden December 24, 1884, No. 398.

To all whom it may concern.-

Be it known `that I, JoNAs WENsTnM, a;

, citizen off Sweden, and a resident of Orebro,

Sweden, have invented a new and Improved Magnetic Separator, of which the following is a full, clear, and exact description.

My invention relates to magnetic' separators of iron ores, the object being to provide a separator of improved construction,which will enable the working simultaneously of stuft containing pieces very different in size, will effect a perfect separation, and will obviate the usc'of brushes or scrapers for removing the pieces held by the magnetism, thus preventing unnecessary wear of the working parts. To accomplish this, I provide in general the following requisites: The stuff to be separated is spread upon a magnetizedrevolving surface, and this surface automatically drops the magnetized particles in a separate place from those non-magnetizable, and the magnetism is utilized in the most direct, concentrated, and undisturbed manner.

The invention will be further particularly described with reference to the accompanying two sheets of drawings, in which- Figure lis a longitudinal sectional elevation of an electro-magnetic separator accord ing to my invention. Fig. 2 is a central vertical cross-section of the same, and Fig. 3 a central horizontal section. Fig. 4 is a vertical section of a modification of the magnetic separator, consisting in the use of permanent steel magnets, (instead of velectro magnets.) Fig. 5 is a longitudinal and partly-sectional elevation of the same, and Fig. 6 a horizontal section. l

A, Figs. 2, 3, 4, 6, is the stationary fieldmagnet tixed and supported by the trunnions B, mounted in sockets or bearings C in the frame D. The armature-barrel E revolves outside the magnets A on the trunnions B byv means of the hubs F of the disks G, to which latter the barrel is fastened.

The barrel may be revolved by cogwheels, as in'Figs. 1 to 3, or by a belt, as in Figs. 4 to 6, or in any other way.

The stuff to be worked is fed through the hopper on the barrel at H, and, following its 5 0 curvature, the non-magnetizable pieces graviin one piece with the trunnions B.

tate at I, but those attractable stick to the surface until transported to the other side of the partition J, where at K they are deposited, being dropped in consequence of getting beyond the influence of the magnetic lield.

The electromagnet (shown in Figs. 2 and 3) is composed ofan iron cylinder furnished with two or more flanges, L, terminating in the polepieces N S. Betweenthese flanges are coiled the insulated wire conductors O for the electric current. Ihese are wound and interconnected ,in such a way that the electric current excites opposite magnetism in successively adjacent flanges. The cylinder is fastened on the trunnions B by hubs cast eccentrically, in order to facilitate the withdrawal of the magnetic poles from that side of the barrel where no magnetism is permitted. The conductors are led to the electric generator through` holes in the trunnions B. y

The permanent magnet, as shown in Figs. 4 and 6, consists of one or more compound or solid horseshoe steel magnets provided with soft-iron pole-pieces N S, arranged in such a way that contiguous poles of adjacent magnets get the same polarity, and are fixed in a frame, P, made from nonmagnetic material and cast In both cases the pole-pieces N S are situated close to thesmooth inside of the barrel; but their compass is limited to the working portion H I K. They are elongated in the direction of the rotation, and arranged side by side in one row longitudinally with poles of alternating polarity. These properties of the poles are the essential features of my invention in regard to the magnets, and such poles may be used also with magnets of other construction than herein specified.

The armature-barrel is composed of an even number or" longitudinal soft-iron bars, R,spaced by non-magnetic material and rmly bound together by the non-magnetic end rings, T, bolted on the disks G. The bars R are partly cut away alternately on the inside, so as to make one bar project only toward the north poles of the magnet and the next one only toward the south poles, and so on, as shown in Figs. 2, 3, 4, 6, thus giving eachsucceeding bar opposite magnetism to the next preceding, in

IOO

order to create powerful magnetic fields in the very place where the stuff is traveling.

The bars R may be of the shape of crosssection shown in Fig. 2, resembling rails; or they may be plainly rectangular, as in Fig. 4, or of any other suitable form; but I prefer to make them such that they will present to the magnets as large a foot as possible, united by a narrow body with a wide face for the stud to be worked on. The working-surface of the bars may be provided with pins or projections fw w, Figs. 1 and 2, to prevent rolling or sliding of the stuff, and the spaces between the bars may be hollowed out, as shown at x, Fig. 2, to permit large pieces to touch two bars simultaneously.

The stuft may be transported by the barrel; or it may be made to pass the barrel with greater velocity or in a direction contrary to that of the barrel s motion.

XVhat I claim as new in magnetic separators, and desire to secure by Letters Patent, 1s-

1. In a magnetic separator, in combination with a stationary magnet, an armature-barrel revolving around the said magnet, the said barrel being composed of a series of longitudinal soft-iron bars alternating with non-magnetic material, substantially as herein specified.

2. In combination with a stationary magnet constructed with a series of alternate north and south poles, an armature-barrel revolving around the said magnet, the said barrel being composed of aseries oflongitudinal softirou bars alternating with non-magnetic material, and the alternate bars being cut away or hollowed, one opposite to the north poles and the next opposite to the south poles of the sta tionary magnet, whereby the said alternate bars receive opposite polarity by magnetic induction from the stationary magnet, substantially as herein specified.

3. In combination with a stationary magnet, an armature-barrel revolving around the said magnet, composed of' soft-iron bars having inward projections toward the several poles of the magnet, substantially as herein set forth.

4. In a magnetic separator, a stationary electro-magnet composed of an iron cylinder having a series of pole-flanges projecting from its periphery at intervals along its length, and wire coils between the said pole-anges, the wires being so wound as to produce opposite polarity in the alternate pole-flanges when the electric currents are passed through the coils.

5. In a magnetic separator, a stationary electro-magnet constructed with a series of alternate north and south poles at intervals along its length, in combination with an armaturebarrel revolving around the magnet and composed of a series of longitudinal soft-iron bars alternating with non-magnetic material, substantially as herein specified.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

JONAS wnNsrRM.

Witnesses:

NERE A. ELFWING, E. H. BRUHN. 

